We present macroscopic experimental evidence for field-induced microscopic quantum fluctuations in different hole- and electron-type cuprate superconductors with varying doping levels and numbers of CuO2 layers per unit cell. The significant suppression of the zero-temperature in-plane magnetic irreversibility field relative to the paramagnetic field in all cuprate superconductors suggests strong quantum fluctuations due to the proximity of the cuprates to quantum criticality.
@article{arxiv.cond-mat/0612380,
title = {Macroscopic evidence for quantum criticality and field-induced quantum fluctuations in cuprate superconductors},
author = {A. D. Beyer and V. S. Zapf and H. Yang and F. Fabris and M. S. Park and K. H. Kim and S. -I. Lee and N. -C. Yeh},
journal= {arXiv preprint arXiv:cond-mat/0612380},
year = {2007}
}
Comments
3 figures. To appear in Phys. Rev. B, Rapid Communications (2007). For correspondence, contact: Nai-Chang Yeh (e-mail: [email protected])